Method for increasing gold leaching rate through suspension roasting of carbon-containing gold ore

Abstract

A method for increasing the gold leaching rate through suspension roasting of a carbon-containing gold ore includes the following steps of firstly, breaking and grinding the carbon-containing gold oreto obtain a fine ore; secondly, conveying the fine ore to a pre-oxidizing and suspension roasting furnace, making the fine ore at a suspension state under the action of gas flow and negative pressure, and heating the fine ore to 650-700 DEG C for dearsenification roasting to obtain pre-oxidized and roasted powder; thirdly, introducing the pre-oxidized and roasted powder into a strong-oxidizing and suspension roasting furnace, making the pre-oxidized and roasted powder at a suspension state under the action of gas flow, and performing strong-oxidizing and roasting at 550-600 DEG C to obtain strong-oxidized slag powder; fourthly, grinding the ore after cooling to obtain a secondary fine ore; and fifthly, adding water to prepare ore slurry, then adding sodium cyanide to be evenly stirred forcyanide leaching, and filtering a material subjected to leaching to obtain a liquid-phase gold-containing cyanide leaching solution. The method is high in production continuity and high in adaptability to different ores and equipment can be easily upsized and industrialized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for enhancing gold leaching rate by suspending and roasting carbon-containing gold ore. Background technique [0002] Carbon-bearing gold ore is one of the difficult gold ores to treat. When the carbon content in the primary gold ore exceeds 0.2%, it will seriously interfere with the cyanidation gold extraction, and the phenomenon of "gold robbery" will obviously affect the gold leaching rate. With the dwindling resources of easy-to-handle gold mines, the efficient utilization of carbon-containing gold mines has become increasingly urgent. The cyanide gold extraction method has the characteristics of less cyanide consumption, high leaching rate and strong adaptability to ore. The first choice for gold production. According to statistics, 75% of the world’s gold is produced by cyanide gold extraction; therefore, how to efficiently remove carbon from...

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Problems solved by technology

[0003] Patent CN201710369536.4 relates to a beneficiation method of high-carbon fine-grained microscopic gold ore, which proposes to grind and flotation the raw ore to obtain rough concentrate, then grind the coarse concentrate and then separate to obtain gold concentrate, and then roast the gold concentrate For decarburization and desulfurization, the tailings undergo secondary roasting and leaching to obtain a total gold recovery rate of more than 90%. However, the process is complicated, the roasting time is long (2 to 3 hours), and the leaching rate of the tailings after the second-stage roasting is low, the highest is only 38.64 %, there are problems such as low efficiency, weak production continuity and poor roasting effect

[0004] Patent CN201610474954.5 relates to a method for comprehensively cleaning and recovering gold, carbon, sulfur and silicon in carbon-containing gold ore. carbon and sulfur, the roasted product adopts the method of high temperature and high pressure water leaching to realize the recovery of gold, carbon, sulfur and silicon in carbon-containing gold ore; but the consumption of sodium hydroxide is large, and the quality of carbon-containing gold ore and sodium hydroxide When the ratio reaches 1:1~3:1, high temperature and high pressure are required for leaching, and there are problems such as high cost, narrow process adaptability and difficult product separation.

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